Answer:
The third one which is the one on the bottom to the right under 34 the ont he bottom
4 because that is what's multiplied throughout
If you are just simplifying it it would be 6x because it's 5x plus one more x but if you are trying to find x then I have no idea
Let sister be s. Matthew, M
Matthew is 7years older than twice the age of his sister
M = 7 + 2s
13 = 7 + 2s. 7 crosses the equality to other side and becomes -7
13 - 7 = 2s
6 = 2s Divide both sides by 2
6/2 = 2s/2
3 = s
Sister is 3 years old.
